Bump tools_rev in DEPS so that we can depend on the new `package:extension_discovery` from `devtools_shared`, which is a dependency of DDS.

Change-Id: Ifba7a2efa92e57738cdc752945e6fd9d0b72b424
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/317804
Commit-Queue: Kenzie Davisson <kenzieschmoll@google.com>
Reviewed-by: Devon Carew <devoncarew@google.com>

https://dart.googlesource.com/sdk/+/168ebd9ba92698586ae09d050854024b66ade588

DEPS

diff --git a/DEPS b/DEPS
index 77e7a1d..a38b916 100644
--- a/DEPS
+++ b/DEPS
@@ -71,7 +71,7 @@
   'dart_protobuf_rev': 'd9e8a31d0e4124130fc494b6bdb66e19dbd4770d',
   'dart_pub_rev': '42819a1e10f803eb7f6296692c5a976e1c647360',
   'dart_root_certificates_rev': '692f6d6488af68e0121317a9c2c9eb393eb0ee50',
-  'dart_tools_rev': 'ba55fd692377ec398b61198c602c5302bf65226d',
+  'dart_tools_rev': 'af3fc996d69b2e790a94f4e9f3cd303a2f29d121',
   'dart_watcher_rev': '7457413060ed7403b90b01533a61bd959932122e',
   'dart_webdev_rev': '5081dff0952eb7163f98a508d7b2d976c1573c55',
   'dart_webkit_inspection_protocol_rev': '39a3c297ff573635e7936b015ce4f3466e4739d6',
@@ -262,7 +262,7 @@
 
   'engine/src/flutter': Var('flutter_git') + '/mirrors/engine' + '@' + '9c4db1788f915b85d9f92fa5860a58b40884ae65',
 
-  'engine/src/third_party/dart': Var('dart_git') + '/sdk' + '@' + '64e8d044fa9b59a92a214fb4868631566bf9ebed',
+  'engine/src/third_party/dart': Var('dart_git') + '/sdk' + '@' + '168ebd9ba92698586ae09d050854024b66ade588',
 
   'flutter': Var('flutter_git') + '/mirrors/flutter' + '@' + '9cda30923fd6ba4819cf990dbe4bba7b6544c505',
 

commits.json

diff --git a/commits.json b/commits.json
index 13ebce6..129077b 100644
--- a/commits.json
+++ b/commits.json
@@ -1,5 +1,5 @@
 {
   "engine/src/flutter":"9c4db1788f915b85d9f92fa5860a58b40884ae65",
-  "engine/src/third_party/dart":"64e8d044fa9b59a92a214fb4868631566bf9ebed",
+  "engine/src/third_party/dart":"168ebd9ba92698586ae09d050854024b66ade588",
   "flutter":"9cda30923fd6ba4819cf990dbe4bba7b6544c505"
 }
\ No newline at end of file